"人力操纵传动" can be translated into English as "manually operated transmission" or "human-powered transmission control", depending on the specific context and emphasis.
"Manually operated transmission" is more commonly used when referring to a mechanical system where the operator directly controls the transmission (e.g., in vehicles or machinery), emphasizing the human intervention in the operation.
"Human-powered transmission control" might be used in contexts where the focus is on the energy source (human power) and the control mechanism of the transmission system.
In most cases, especially in mechanical or automotive contexts, "manually operated transmission" would be the most appropriate and widely understood term.